沼氣是各種有機物質(zhì)，在隔絕空氣（還原條件），并在適宜的溫度、pH值下，經(jīng)過微生物的發(fā)酵作用產(chǎn)生的一種可燃燒氣體。沼氣中所含硫化氫在使用前因環(huán)保與工藝要求必須去除。
Biogas is a combustible gas produced by various organic substances, isolated from air (under reducing conditions), and fermented by microorganisms at appropriate temperatures and pH values. The hydrogen sulfide contained in biogas must be removed before use due to environmental and process requirements.
因前端污水處理中厭氧發(fā)酵細(xì)菌作用的不穩(wěn)定，硫化氫濃度也翻倍增加，使得后端脫硫后沼氣中硫化氫指標(biāo)大幅升高，不能滿足下游工序的使用要求。
Due to the unstable role of anaerobic fermentation bacteria in front-end sewage treatment, the concentration of hydrogen sulfide has also doubled, resulting in a significant increase in the hydrogen sulfide index in biogas after back-end desulfurization, which cannot meet the usage requirements of downstream processes.
絡(luò)合鐵脫硫劑具有高硫容、高選擇性的特點。通過采用GLT絡(luò)合鐵脫硫工藝成套裝置取得了很好效果，項目占地面積小，硫化氫指標(biāo)合格穩(wěn)定、生產(chǎn)成本降低。
Complex iron desulfurizers have the characteristics of high sulfur capacity and high selectivity. The use of a complete set of GLT complex iron desulfurization process has achieved good results, with a small project area, stable and qualified hydrogen sulfide indicators, and reduced production costs.
對于10000~60000 Nm3/d，硫化氫含量為0.5～2.5V%中小規(guī)模沼氣脫硫裝置，國力通能實現(xiàn)成撬化設(shè)備供應(yīng)，在滿足客戶工藝需求的前提下解決客戶占地限制的困擾。
For small and medium-sized biogas desulfurization devices with a hydrogen sulfide content of 0.5-2.5V% and a capacity of 10000-60000 Nm3/d, Guolitong can achieve a supply of skidded equipment to solve the problem of land occupation restrictions for customers while meeting their process needs.
脫硫反應(yīng)原理
Principle of desulfurization reaction
絡(luò)合鐵脫硫工藝?yán)脡A性絡(luò)合鐵催化劑的氧化還原性質(zhì)，吸收原料氣中的H2S。H2S被絡(luò)合鐵催化劑直接氧化生成單質(zhì)硫，絡(luò)合鐵轉(zhuǎn)化為絡(luò)合亞鐵，然后在再生過程中鼓入空氣，以空氣氧化催化劑富液中的絡(luò)合亞鐵，使催化劑富液中的絡(luò)合亞鐵轉(zhuǎn)化為絡(luò)合鐵，從而再生回用。產(chǎn)生的硫磺通過硫磺回收系統(tǒng)處理。
The complex iron desulfurization process utilizes the redox properties of alkaline complex iron catalysts to absorb H2S from the feed gas. H2S is directly oxidized by a complex iron catalyst to generate elemental sulfur, which is converted into complex ferrous. During the regeneration process, air is blown in to oxidize the complex ferrous in the catalyst rich solution, converting the complex ferrous in the catalyst rich solution into complex ferrous, thereby regenerating and reusing. The generated sulfur is processed through the sulfur recovery system.
絡(luò)合鐵脫硫反應(yīng)原理如下：
The principle of complex iron desulfurization reaction is as follows:
在總反應(yīng)中，絡(luò)合鐵離子的作用是將吸收反應(yīng)中得到的電子在再生反應(yīng)中轉(zhuǎn)移給單質(zhì)氧。每一個單質(zhì)硫原子的產(chǎn)生需要兩個三價鐵離子參與反應(yīng)。由此，鐵離子盡管參與反應(yīng)，但在總反應(yīng)中并不消耗，而是作為硫化氫和氧氣反應(yīng)的中間電子傳遞物，是催化劑體系的組成部分。
In the overall reaction, the role of chelating iron ions is to transfer the electrons obtained from the absorption reaction to the elemental oxygen during the regeneration reaction. The production of each elemental sulfur atom requires two trivalent iron ions to participate in the reaction. Therefore, although iron ions participate in the reaction, they are not consumed in the total reaction, but serve as intermediate electron carriers in the reaction of hydrogen sulfide and oxygen, and are a component of the catalyst system.
脫硫工藝流程
Desulfurization process flow
雙膜氣柜過來的沼氣經(jīng)增壓風(fēng)機加壓之后進(jìn)入脫硫再生塔的吸收脫硫隔室酸氣中的H2S進(jìn)入反應(yīng)隔室與催化劑中的Fe3+反應(yīng)并轉(zhuǎn)化為單質(zhì)硫，與此同時Fe3+還原成Fe2+ 。
The biogas from the dual membrane gas tank is pressurized by a booster fan and enters the absorption and desulfurization compartment of the desulfurization regeneration tower. H2S in the acid gas enters the reaction compartment and reacts with Fe3+in the catalyst, converting it into elemental sulfur. At the same time, Fe3+is reduced to Fe2+.
反應(yīng)后的溶液通過自循環(huán)進(jìn)入氧化隔室，通過風(fēng)機向氧化再生隔室鼓入空氣中的氧，將Fe2+氧化為Fe3+后再自循環(huán)回吸收和反應(yīng)隔室繼續(xù)與H2S進(jìn)行吸收反應(yīng)可脫除酸性氣中99.99%以上H2S。
The solution after reaction enters the oxidation chamber through self circulation, and oxygen in the air is blown into the oxidation regeneration chamber through a fan. Fe2+is oxidized to Fe3+, which is then self circulated back for absorption and the reaction chamber continues to absorb and react with H2S to remove over 99.99% of H2S from the acidic gas.
生成的單質(zhì)硫在脫硫再生塔底部的錐形段沉降后，由硫磺漿泵送板框過濾機進(jìn)行硫磺過濾；脫硫后凈化氣經(jīng)氣液分離送出界區(qū)外。廢空氣在脫硫再生塔頂部排出裝置。
After the generated elemental sulfur settles in the conical section at the bottom of the desulfurization regeneration tower, it is pumped by the sulfur slurry to the plate and frame filter for sulfur filtration; The purified gas after desulfurization is sent out of the battery limit through gas-liquid separation. The waste air is discharged from the top of the desulfurization regeneration tower.
技術(shù)特點
Technical characteristics
成套絡(luò)合鐵脫硫技術(shù)對于沼氣凈化具有如下優(yōu)點：
The complete set of complex iron desulfurization technology has the following advantages for biogas purification:
（1）原料氣脫硫中硫化氫一步轉(zhuǎn)化為硫磺，凈化氣硫化氫濃度低于10ppm。
(1) In the desulfurization of raw gas, hydrogen sulfide is converted into sulfur in one step, and the concentration of hydrogen sulfide in the purified gas is less than 10ppm.
（2）裝置操作彈性大，硫化氫濃度從0.5～2V%波動均不影響裝置運行。
(2) The device has high operational flexibility, and fluctuations in hydrogen sulfide concentration from 0.5 to 2V% do not affect the operation of the device.
（3）吸收、再生及硫磺沉降均在一個設(shè)備中，設(shè)計一體化，工藝簡單，節(jié)省占地。
(3) The absorption, regeneration, and sulfur deposition are all in one equipment, with integrated design and simple process, saving land.
（4）催化劑環(huán)境友好，脫硫過程無“三廢”排放。
(4) The catalyst is environmentally friendly, and there are no "three wastes" emissions during the desulfurization process.
（5）運行可靠，保證長周期穩(wěn)定運行。
(5) Reliable operation, ensuring long-term stable operation.
（6）采用橇裝方式供貨，可根據(jù)需要移動。
(6) Supplied in a skid mounted manner and can be moved as needed.
（7）每立方沼氣脫硫系統(tǒng)的單位運行成本可降低。
(7) The unit operating cost of each cubic meter of biogas desulfurization system can be reduced.
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